CN100376146C - Anti-block designing method of drip irrigation tool based on two-phase simulated flow - Google Patents
Anti-block designing method of drip irrigation tool based on two-phase simulated flow Download PDFInfo
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- CN100376146C CN100376146C CNB2006100184937A CN200610018493A CN100376146C CN 100376146 C CN100376146 C CN 100376146C CN B2006100184937 A CNB2006100184937 A CN B2006100184937A CN 200610018493 A CN200610018493 A CN 200610018493A CN 100376146 C CN100376146 C CN 100376146C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/22—Improving land use; Improving water use or availability; Controlling erosion
Abstract
The present invention discloses an anti-block designing method for a drip douche based on two-phase simulated flow. Through numerical simulation of two-phase flow of a flow field in a douche, the method analyzes regions where solid phase objects are easy to deposit in a flow channel according to a simulation result so as to analyze the influence of the flow channel structure on migration and deposition characteristics of solid phase objects. On the basis, a plurality of parameters of the flow channel structure are properly modified, and two-phase flow simulation is repeated until solid phase objects in the whole flow channel do not obviously stagnated or the local density is concentrated. The two-phase flow simulation provides visualized blocking verification link for the structure design of an anti-block flow channel of a drip douche and provides a scientific and feasible method for prediction and optimization of the anti-block capability of the douche. After the structure of a douche with a good hydraulic performance is obtained, an RP/RT combined method is adopted to make a test sample of the douche, which greatly shortens experimental manufacturing time, reduces experimental manufacturing cost, keeps the coincidence of sample forming material and the material of a finished product, and enhances the forming precision.
Description
Technical field
The invention belongs to the agricultural water-saving irrigation technical field, be specifically related to a kind of anti-block designing method of drip irrigation tool based on two-phase simulated flow.
Background technology
The blockage problem of irrigator is to hinder drip irrigation technique to use and the biggest obstacle that develops always.Press the plugging reason classification, the caused chemistry of indissoluble salt that has the physics that is caused by solid particle to stop up, generated by chemical reaction stops up and is stopped up by the biology that microbial activities and growth cause.At various blockage problem, lot of domestic and foreign expert has carried out a large amount of scientific researches for a long time, to disclose the blocking mechanism of irrigator, seeks and effectively stops up control and prevent and treat method.Existing obstruction solution route mainly is to strengthen purification of water quality and filtration, or feeds some reagent with special role (as acidifying, oxidation etc.) (example hydrochloric acid, chlorine etc.) and recover blocked or irrigator that part is stopped up in the drip irrigation system.These methods have positive role for the blockage problem that solves irrigator.But the immediate cause that irrigator stops up should be migration rule and the deposition characteristics of various forms blocking medium in irrigator slight curves runner, so these methods can not fundamentally be eliminated the blockage problem of irrigator.
In order to prevent the obstruction of irrigator, except water quality is handled, improve the flow passage structure of irrigator, also be one of effective way with the anti-blockage capability that improves irrigator self.Yet the irrigator channel size is small, complex-shaped, adopts existing research technique to be difficult to the microcosmic hydraulic structure in its flow field of observation.So, some scholars utilize computational fluid dynamics (Computational FluidDynamics, method CFD) is come the small flow field of visual irrigator, the flow field result who obtains by simulation analyzes the hydraulic performances such as anti-blockage capability of irrigator.Existing C FD method mainly realizes the single-phase simulation that water flows, and analyzes the possibility that deposition takes place the solid phase blocking medium indirectly with pressure, the velocity distribution results of water flow field, and in runner residing position.This method has been ignored the existence of blocking medium, therefore simulates the flow field characteristic that obtains and has error, and artificial in addition indirect analysis also may cause further deviation.
Summary of the invention
The object of the present invention is to provide a kind of anti-block designing method of drip irrigation tool based on two phase flow, the designed drip emitter of this method can make the impurity that enters in the irrigator can not deposit the obstruction of getting off to cause runner.
A kind of anti-block designing method of drip irrigation tool based on two-phase simulated flow provided by the present invention the steps include:
(1), adopt 3D sculpting software to make up irrigator labyrinth runner two phase flow analytical model;
(2), carrying out grid division and boundary condition sets:
According to channel size size and cross sectional shape situation of change, adopt the finite element pre-processing software to produce three-dimensional non-structure tetrahedral grid and encrypt the near wall grid from surface mesh;
Import and exit are boundary condition with pressure, and entry condition is made as inlet pressure, and exit condition is made as outlet pressure, and all the other positions are boundary condition with speed, and it is 0 that the speed of establishing is just measured;
(3), use the general solver in the finite element analysis software based on unstructured grid, carry out numerical simulation calculation based on Euler-Lagrangian two phase flow model, draw speed, the particle density distribution map of irrigator flow field, find out corner and converge the place;
(4), carry out anti-blocking structural analysis of labyrinth runner and optimization, adopt circular arc to replace the right angle transition above-mentioned corner, for converging the place, change the shape of current block, low regime is become the part of block;
(5), adopt quick original shape/rapid die-manufacturing composite algorithm to make irrigator test exemplar;
(6) flow---the pressue-graph and the irrigator water outlet uniformity Cv of measurement irrigator standard component in the laboratory according to the experimental data that draws, make amendment to the irrigator channel size.
Method for designing of the present invention is applicable to that various types of drip emitters resist the design of obstruction runner, and the runner performance of anti-blockage after the optimization all has significantly lifting.Low regime can both be by clear demonstration in the speed countercurrent zone of the corner that departs from the speed main flow area promptly flows stagnation region and runner, and by the optimization of structure it is eliminated; Architecture advances by 1～2 time, just can make the solid formation in the fluid significantly delay can not occur or local density occur concentrating in low regime, so do not have the solid formation crystallizing field in this runner, promptly the anti-blockage capability of runner is improved, the long-time use of runner can not blocked yet.The present invention adopts quick original shape, rapid die-manufacturing composite algorithm to make irrigator test exemplar, can shorten the manufacturing cycle, reduces experimental manufacturing cost, and can keep the consistent of sample moulding material and final product material, has improved the typing precision.
Description of drawings
Fig. 1 is the schematic flow sheet of the inventive method;
Fig. 2 is the structural representation of rhombus labyrinth flow-path of the present invention;
Fig. 3 is rhombus labyrinth flow-path geometrical model figure of the present invention;
Fig. 4 is a runner velocity distribution map of the present invention;
Fig. 5 is a solid formation density profile in the runner of the present invention;
Fig. 6 is a runner of the present invention local velocity polar plot;
Fig. 7 is a solid formation Density Distribution partial enlarged drawing in the runner of the present invention;
Fig. 8 is the rhombus labyrinth runner structural representation after the present invention optimizes;
Fig. 9 is the interior speed vector figure of the labyrinth flow-path after the present invention optimizes;
Figure 10 is the interior solid formation density profile of the labyrinth flow-path after the present invention optimizes.
Embodiment
The present invention is further detailed explanation below in conjunction with accompanying drawing and example.
The step of the inventive method is an example with drip emitter rhombus labyrinth flow-path as shown in Figure 1 below, specifies the step of its flow passage structure optimal design:
1, makes up irrigator labyrinth runner two phase flow analytical model
As shown in Figure 2, realize the Geometric Modeling of runner with 3D sculpting software (as softwares such as UG or PROE), the labyrinth flow-path threedimensional model that makes up according to channel size parameter shown in Figure 2 as shown in Figure 3.
2, carrying out grid division and boundary condition sets
Because runner does not have the perk radian, but size is less, and a large amount of turnings are arranged, the present invention adopts finite element pre-processing software (as softwares such as Tgrid or GAMBIT) to produce three-dimensional non-structure tetrahedral grid and encrypt the near wall grid from surface mesh according to channel size size and cross sectional shape situation of change.
Boundary condition is set:
Import and exit are boundary condition with pressure, and entry condition is made as inlet pressure, the hydraulic pressure 0～10kPa+ atmospheric pressure (101325Pa) of irrigating promptly commonly used, and gauge pressure is 0～10kPa.Exit condition is made as outlet pressure, i.e. atmospheric pressure 101325Pa, and gauge pressure is 0Pa.All the other positions are boundary condition with speed, and it is 0 that the speed of establishing is just measured.
3, carry out the flow simulating of labyrinth runner fluid
Fluid properties in the runner is a solid, liquid two-phase stream, and solid phase wherein is a solid particle, microorganism etc., and its diameter range is 0.001mm～1mm, concentration range is 200ppm～10000ppm.The volume ratio of solid phase is low, and the interaction between solid phase can be ignored.
In software FLUENT, there is the method for two kinds of numerical computations to handle multiphase flow: Euler-Lagrangian method and Euler-Euler's method.Wherein Euler-Lagrangian model basic assumption is, should be very low as the volume ratio of the second discrete phase, meet the situation of fluid in the irrigator, and therefore select this model for use.
Use the general solver in the finite element analysis software (as ANSYS, FLUENT etc.) based on unstructured grid, carry out analog computation based on the two phase flow analysis theories, draw speed, the particle density distribution map of irrigator flow field, by speed and particle concentration distribution partial enlarged drawing, can draw around the corner, solid phase speed is generally very low even stop and should the zone be the solid phase accumulation regions, so solid phase is easy to deposition, claims this zone to be corner's (seeing A district among the figure); The current block is arranged in the irrigator, and after current flow through block, flow velocity was little, caused the breeding of microorganism easily, caused biological the obstruction, claimed this zone to be the place of converging (seeing B district among the figure); In addition, having drawn a kind of special area by sunykatuib analysis exists: particle concentration is relatively very big, but flow rate of water flow herein is also relatively large, and particle is not easy under the deposition in this zone, can not cause the obstruction of solid solid, claim this zone to be mesozone (seeing C district among the figure); And at the runner latter half, since the obvious reduction of pressure, the easier obstruction.
On the finite element software platform, finish the speed that chip streams irrigator, the simulation that particle density distributes: respectively as Fig. 4, shown in Figure 5, Fig. 6, Fig. 7 are speed and particle concentration distribution partial enlarged drawing, in Fig. 6, Fig. 7, can know and see corner's (seeing A district among the figure), solid phase speed is very low even stop and should the zone be the solid phase accumulation regions, so solid phase is easy to deposition.Zone behind the rhombus block, it is little to be referred to as place's of converging (seeing B district among the figure) flow velocity, causes the breeding of microorganism easily, causes biological the obstruction.
4, anti-blocking structural analysis of labyrinth runner and optimization
Because the irrigator width of flow path is between 0.5mm～1mm, the deposition of small amount of impurities just is easy to result in blockage, and whole irrigation system is affected.By particle crystallizing field among the figure as can be seen in the runner deposition of the A of corner solid phase can directly dwindle flow diameter, the B of the place of converging microorganism and solid phase impurity are easy to assemble agglomerating, be adsorbed on the block rear wall, because the relative size at this place is bigger, even agglomerating particle comes off, the runner that also can block the back is so should avoid in design as far as possible.
As seen from the above analysis, there is easy blocked-off region in structure for the irrigator runner, designing requirement according to the anti-blockage structure of irrigator, with reference to two phase flow numerical simulation result in the runner, flow passage structure at the easy lodgment of particle that exists is optimized design, remove the easy blocked-off region in the runner, improve the flow behavior of particle in runner.Specific implementation method is: for the A of corner, adopt circular arc to replace the right angle transition, so just avoided particle around the corner because speed is too low, under the effect deposit of gravity, and removed the promptly mobile stagnation region of current countercurrent zone; For converging the B of place, the reduction of speed effect of current block produces local losses, but has just had low regime behind block, in order to make the microorganism that swims can not deposit at the B of the place of converging, changes the shape of current block, is about to the part that low regime becomes block.For the A of corner and converge the mesozone C of place between the B, though the solid concentration height is concentrated relatively,, can not deposit because water velocity is higher, this zone no longer needs optimization.After said structure optimization, there is not the easy crystallizing field of impurity in whole runner, has improved the block resistance of irrigator greatly.
Flow passage structure by optimal design as shown in Figure 8, the two-phase simulated flow result's of the rhombus labyrinth runner inner fluid of optimizing speed vector figure as shown in Figure 9, the solid formation density profile as shown in figure 10, its overall flow characteristic has greatly improved, the promptly mobile stagnation region of speed countercurrent zone has not around the corner had, low regime behind the rhombus block also is eliminated, see A district, the B district of Figure 10, C district, solid phase concentrated area speed is higher, can not deposit, so there is not the easy crystallizing field of impurity in whole runner yet.Thereby the block resistance of the irrigator of the rhombus labyrinth runner of process optimization is enhanced.
5, adopt RP/RT (Rapid Prototyping/Rapid Tooling, original shape/rapid die-manufacturing fast) composite algorithm to make irrigator test exemplar
After the structure typing, utilize the 3D sculpting software platform on computers, draw the stl file of the irrigator threedimensional model that designs, on quickly shaping device, utilize this stl file directly to produce single-piece irrigator original shape, then adopt Rapid tooling to turn over system silica gel mould, in the vacuum impregnating molding machine, finish the making of the irrigator test exemplar of small batch at last.In the laboratory, measure flow---the pressue-graph and the irrigator water outlet uniformity Cv of this irrigator.The experimental data that in this process, draws, directly the critical size (length of runner) of irrigator is made amendment, the irrigator of flow, operating pressure and water conservancy performance requirement has obtained meeting the requirements, do not criticize part less and do not need the machining experiment punching block to produce, just can realize the fast shaping of irrigator, greatly reduce cost, shortened the development time.
Claims (1)
1. the anti-block designing method of drip irrigation tool based on two-phase simulated flow the steps include:
(1), adopt 3D sculpting software to make up irrigator labyrinth runner two phase flow analytical model;
(2), carrying out grid division and boundary condition sets:
According to channel size size and cross sectional shape situation of change, adopt the finite element pre-processing software to produce three-dimensional non-structure tetrahedral grid and encrypt the near wall grid from surface mesh;
Import and exit are boundary condition with pressure, and entry condition is made as inlet pressure, and exit condition is made as outlet pressure, and all the other positions are boundary condition with speed, and it is 0 that the speed of establishing is just measured;
(3), use the general solver in the finite element analysis software based on unstructured grid, carry out numerical simulation calculation based on Euler-Lagrangian two phase flow model, draw speed, the particle density distribution map of irrigator flow field, find out corner and converge the place;
(4), carry out anti-blocking structural analysis of labyrinth runner and optimization, adopt circular arc to replace the right angle transition above-mentioned corner, for converging the place, change the shape of current block, low regime is become the part of block;
(5), adopt quick original shape/rapid die-manufacturing composite algorithm to make irrigator test exemplar;
(6) flow---the pressue-graph and the irrigator water outlet uniformity Cv of measurement irrigator standard component in the laboratory according to the experimental data that draws, make amendment to the irrigator channel size.
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| US8150668B2 (en) * | 2009-02-11 | 2012-04-03 | Livermore Software Technology Corporation | Thermal fluid-structure interaction simulation in finite element analysis |
| CN101667218B (en) * | 2009-10-22 | 2011-02-23 | 北京市水利科学研究所 | Anti-clogging design method for emitter used for eliminating suspended particle aggregation position in runner |
| CN105706854B (en) * | 2016-03-17 | 2019-04-12 | 西安交通大学 | A kind of anti-stifled douche of the bicyclic flow phenomenon in section based on bend |
| CN108427822B (en) * | 2018-01-18 | 2021-07-09 | 中国农业大学 | Vortex wall washing optimization method for improving anti-blocking performance of irrigator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1582631A (en) * | 2004-05-25 | 2005-02-23 | 华中科技大学 | Pre-suck and anti-block irragator |
| CN1636437A (en) * | 2004-12-13 | 2005-07-13 | 西北农林科技大学 | Flow passage structure design method for anti-blocking turbulant irrigator |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1582631A (en) * | 2004-05-25 | 2005-02-23 | 华中科技大学 | Pre-suck and anti-block irragator |
| CN1636437A (en) * | 2004-12-13 | 2005-07-13 | 西北农林科技大学 | Flow passage structure design method for anti-blocking turbulant irrigator |
Non-Patent Citations (1)
| Title |
|---|
| 滴灌灌水器迷宫流道主航道抗堵设计方法研究. 魏正英等.农业工程学报，第21卷第6期. 2005 * |
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